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Commit 89165e57 authored by Niels Möller's avatar Niels Möller
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Expanded comment.

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macros.h
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......@@ -142,7 +142,8 @@ do { \
(src) += (blocksize)) )
/* The masking of the right shift is needed to allow n == 0 (using
just 32 - n and 64 - n results in undefined behaviour). */
just 32 - n and 64 - n results in undefined behaviour). Most uses
of these macros use a constant and non-zero rotation count. */
#define ROTL32(n,x) (((x)<<(n)) | ((x)>>((-(n)&31))))
#define ROTL64(n,x) (((x)<<(n)) | ((x)>>((-(n))&63)))
......
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